Gary Johnson wants 'stay out', essentially, but with different focus vs. Trump. Gary's position, only somewhat changed since 2012, is here: http://politic365.com/2012/10/12/libert ... -al-qaida/
He's talked about it every day since his May 31 nomination as POTUS, and Bill Weld also knows a great deal about the issue. Some would claim Bill has more expertise, but he thinks Gary savvy.
As for Evan McMullin? Word salad. Ignore him. Very disappointing, for a guy who's supposed to be former CIA.
Hillary Clinton wants 'go in', but in a measured way. So she intends.
History and Bible tell us there's no middle here. Russia has always sought to dominate the ME, always will. So that argues in favor of HRC, to defend Israel and lower our cost of preventing WWIII, which per Bible will happen anyway when Russia swoops down.
So go in or stay out, for US policy? I really don't know. I tried to explain it more here, in case you want to brainstorm (30 mins), http://www.brainout.net/RusSyriaOptions.MP3